Selective system



J. H. BELL.

SELECTIVE SYSTEM.

APPLICATION FILED IULY 26|I9I1.

Patented Aug. 9, 1921.

A fry.

UNITED JOHN HUME BELL, or EAST ORANGE, NEW JERSEY, A''ssIGNoE 'ro WEs'ri-JNN` ELEC-Y Tmc COMPANY, iNooRroEA'rED, or lNEW YomcN. Y., y'aconroE/,rrioN` ory NEW YORK.

Application filed July 26.

To all whom t may concern y Beit known that I, JOHN H. BELL, a citizen of the vUnited States, residing at East Orange, in the county of Essex and State of New ersey, have invented certain new and useful Improvements inl Selective Systems, of which the 'following is a full, clear, concise, and exact description.

' This invention relates to selective systems, and more particularly it relates to a selective system for use in printing telegraphs and the like. v f

ltsl object is to provide an arrangement which isV adapted touse with a three-unit code, and one which may, therefore, be employed economically in connection with expensive Vline conductors, such as submarine l cables.

Inv accordance Withtthis invention three line relays are provided and connected to the 4line circuit. 'One of these relays is re-`v sponsive to all impulses in the line circuit regardless of the strengthor polarity thereof. The second and third relays are selectively responsive to impulses of strong positive or 'negative'. current respectively. A contact makingV device, having a plurality of Y. 1 contacts and a movable contact member, such as a rotary dlstributer, serves to connect one of severalrgroups or relays to the tongue of the irs't relay, with each impulse of current in the line circuit. From here on individual circuits extend from each re- Y lay in the roup to the contacts of the second and third line relays. The connections to'these contacts are such that not more than one relay-n a *group can beenergized lat a time;V Theidistributer and line relays there-v This arrangement .may easily be applied to printing telegraph systems, one method being-to have the relaysfset up various combinations fin an electromechanical selecting system, which would allow the printing 'of a certain letter or character for each combisELEoTIvE SYSTEM.

nationl setup. The relays themselves might' aug-S 9,1921.

1917. seiia1-N0..11s2,961.

perform this function, or they "might be caused to control energizing circuits fory electromagnetic devi'ces, as lshown on the". accompanying drawing, and these devices in turn set up the combination. Y

v The above and other objects of this rinvention `will be fully'set forth in the oli lowing descriptionand claims,fand will-be more readily understood by reference to the accompanying sdrawing, Vwhich .shows a diagrammatic representation of the and` system of connections. y n The line L is'connected to ground through the Windingsof three relays, V1, 2,. and 3.A Relay lfs'fa polarized relay,fand responds to all impulses of current in the line 1 circuit, thetongue 4 connecting 'Withtheconapparatusv tact4 5 v for each impulse of. `positive current,

and with the contact for :each impulse of negativecurrent Relays-2and 8 are biased yto lrespond to impulses of strong positive or` negative current, respectir'fely. The tongue 4l ofV relayl 1 1s electricallyconnected.to theY contact arm 7 .of a distributer'S by means o f-- a collector ring 9. Contact armf? ,is adaptedk to make connection with segments 10, 11 and 12, etc., of the distributer 8. n fv In order to simplify. theidescriptionand avoid confusion by multiplicity" of parts 4on the ydrawing-gi onlyo'ne-v group off-receiving equipment is. "shown connected to fthe y f. distributer 8. :lt is obvious,'however, that' other groups of receiving equipment maybe thus connected to the idle segmentsotthe distributer, .f so thatv a 'number of receiving instrumentsmay be operated to receive. several. distant; messages being 'transmitted over .the lineconductor f l. 1i

lThe segments 10, 11and12 ot theldistributer- 8. areconnected yby Vmeans of the conductors 13,14 and v15 with three groupsof relays; conductor. 1 3being connected to relays V16, 17'and 18, conductor 14j to relays v19, 2O and 21,-and conductor. 15 to relay '22.-v From herejon,each individual relay is connected toone otthree conductors which' terl mina-te respectively at the 1contacts. 23/,and 24. of relay 2, and contac`t251of relay 3. For example, relay. 16 Y is connected to conductor 26 which terminates at contact 24; relay 171is connected to conductor27which terminates `atgcontact 23, and relay 18 if connected to conductor 28 which terminates at Contact 25. Each relay in these groups is provided with an armature having two contacts which close when the relay is energized. A common lock-up circ-uit isy connected to the contact 29 of each relay and serves to hold the relay in the energized position after it has been actuated. The lock-up circuit mayv be traced from thebattery 30, conductor 31, point 32, armature 33 and back contact 34 of cut-off relay 35, common conductor 36 to the lock-up windings 37 and contacts `29 of relays 16 to 22, through the armatures 38 et. relays 16 to 22, to the common Vconductor 39, point 40, and return over conductor 41 to the battery 30. l

The drawing shows electromagnetic devices 42 to 48 one ot' which is individual to each relay, with an energizing circuit which is completed by the closing of the second contact 68 when the relay is actuated. 5These electromagnetic devices 42 to 48 may be. the selecting` magnets ot a receiving printer similar, for example, to that shown inDiXon Patent No. 1,201,809, or they may be omitted entirely, the relays 16 to 22 themselves performing` the function of selecting magnets.

A better understanding of the systemv be had by following the various. operations that take placeupon the receipt of a signal,

and for the purpose ot illustration, let it bev assumed that impulses corresponding to the letter A are to be transmitted, and let it further' be assumed that the first impulse is strong positive current, the second weak negative current and the third weak positiv current. Y y

The arm 7 of the distributer or switching means 8 is rotated at a constant speed by any suitable means (not shown), and is kept in synchronism with a similar sending distributer by any of the methods well known in the art, Thus, when the first impulse is received theV arm 7 will be in contact with segment' 10, when the second impulse is received the arm 7 will be in Contact with. segment 11, etc; rThe first impulse being strong positive, the tongue 4 of the relay 1 is moved to the right and' connects with the contact 5; and the tongue 49 of the relay 2 is moved to the left andconnects with the contact 24.; relay 3 remains inoperative. rent then Hows from the battery 30 by way of conductor31, point 50, contact 5, tongue 4 of relay 1 to collector ring 9, contact arm 7, segment 10, conductor 1 3, point 70, winding 51 vof'relay 16, conductor 26, contact 24 andv tongue 49 ot' relay 2 and back over conductor 41 tothe battery 30. Armature 38 ot' relay 16 is therefore pulled upy and contacts 52 are closed; This locksup relay 16 by energiz-V ing lthe winding` 37.v This circuit istraced trom the battery30,-conductor 31, pOint32, armature 33 and contacts 34 of cut-off relay Cur- Y 35, conductor 36, winding 37, contact 29, and armature 38 of relay 16, conductor 39, point 40, and return over conductor 41 to the Abattery 30. Electromagnetic device 42 is now energized by the current from battery 30, conductor 31, point 53, magnet 42, conductor 55, contacts 52 and 68 of relay 16, conductor 39, point 40 and conductor 41. `This completes the reception of the first impulse, and relay 16 remains in a locked position asfthe arm 7 of the distributer 8 passes on to segment 11.

Upon reaching segment 11, the second im pulse (weak negative current) Ais received. T his moves the tongue 4 of the relay 1 to the lett, making connection with contact 6,: and` relays 2 and 3 remain inoperative. lt will. be observed that no relay in the second group will respond to this impulse,for the nega.- tive pole ot the battery 30 is now connected to the. seco-nd group comprising relays 19, 20 and 21 by way of t-he distributer 8 and contact 6 of relay 1, and no connection can be had to the positive side of the battery 30, for contacts 24 of relay 2 and contacts25 of relay 3? are open, andcontactf23of relay 2 is connected to the negative side ot' the battery 30. I Y

1t is' obvious that the tonguesof the relays. or impulse receiving units 1, 2 and 3 will assume tie vabove position with all weak negative in'ipulses,l and that none of the re-l lays 16 to 22 will be energized by impuls-es et this character, regardlessot which group is connected to the distributor at the time the impulse is received.

rlie. arm 7 of the distributer 8 has now passed on t-o the next seOment 12 as the third impulse (weak positive current)v is received.r rthis moves the tongue 4 of the relay 1 to the right, making connection with the co-ntact 5 and the relays 2 land 3 remain inoperative. Current now flows from the battery 30 by way ot 'conductor 31, point 50, Contact 5 and tongue 4 of relay `1 to collector ring 9, contact arm 7, segment 12, conductor 15, winding of relay 22, point 57, conductor 27, contact 23, and tongue 490il relay 2 and return over `conductor 41 to the batte-ry 30. rlhe armature 38 of the relay v22 is pulled up and locked in position, andthe electromagnetic device 48 is energized, in the Ysame manner as took place for relay 16 whenV the :first impulse was received. l By means of auxiliary equipment vasso'- ciaterl with the receiving apparatus (not shown on Vthe drawing), the printing of a certain-letter or character, determined by theenergization ot electromagnetic devices 42 and 48, takes place; after which thencutott relay 35 is energized by the closing of a circuit by. the distributer '8. This circuit may be traced from battery 58,: conductor 59, segmentl 60, arm 7 o-fdistributer 8, segment 6l, conductor 62, the winding of cutofi'` relay 3 5, and i' return lover I conductor. 64 Y i to :the battery l'58. The energization of cutoff'i'el'ay 35 opens the contact 34 in the lockup circuit and `allows relays 16 and 22 and their, associated electromagnetic devices 42 and 48 to return to their normall position.

IVith'out going into a 'further detailed de-l scription of thev various operations that take place upon the receipt of a signal whose impulses are of a different character from those abo-ve selected for illustration, it will be observed by reference to the drawing, that two relays 16 and 19 are caused to operate by impulses of strong positive current in the line circuit L, two relays 18'and .21 by impulses o-f strong negative current, and three relays 17, 20 and 22 by impulses of weak positive current. Impulses of weak negative current have no effect upon the receiving apparatus in so far as their influence affects the operation of any of the relays.

VThey do, however, cause the tongue 4 of the relay 1 toclo-se against contact 6 which is connected `to the negative pole of the battery 30, but no return path to the positive pole of the battery 30 is provided, for the tongue 49 of relay 2 is also connected to the negative side, and the contact 25 of relay 3 is open.

What is claimed is: i l.V In a telegraph system, a line, a plurality of impulse receiving relays serially connected with said line, a plurality of selecting relays, a source of potential, and

means for consecutively connecting said lays of said groups as selected. by said first and second line relays.

3. In a signaling system wherein the various characters of a message are represented by impulses of different intensities of positivo or negative current, a receivingmeans comprising a line relay responsive to Vall impulses of current in the line circuit, a :local circuit including the tongue of said line relay, a distributer adapted to connect the tongue of said line relay successively to each of a plurality of segments of said distributor, a group of relays individual to each segment of said distributer, and selecting relays responsive to impulses of a certain character in the line circuit, said selecting relays coperatingwith said distributerfand said line relay to"v complete said 'localfcircuit to not morethan one relay in'eac'hl of said groups. l y d 4. In a telegraph system, a line, a plu'- rality of impulse receiving relays connected withsaidline,y a plurality of selectingl relays, asource of potential, and a rotary distributer for establishing an energizing circuit for said selecting relays through contacts operated by a pair of said impulse receiving relays. i

5. In a telegraph receiving system, a plurality of groupsof selecting relays, a .source of current, a line relay responsive to line current impulses for partly establishing a circuit between said selecting relays and source of current, additional lineivrelays responsive to current impulses of predetermined strength and polarity for selectingV one of said groups of relays, and rotary distributer means for completing the partly established circuit to energize a selected one of said relays.

6. In a telegraph receiving system, a plurality of groups'of selecting relays.z distributer means, Va source of current,.a first line` relay. to coperate with said distributer in.Y Y applying said source of current to said groups of relays, a second and third line relay forselecting relays in said groups, and interconnections between -said linerelays to enable saidk distributer to effect operation of selected ones of the relays of said plurality of groups.` l

7; In a telegraph receiving system, three polarized line relays, a first anda second group of selecting relays, a source 'of curdirectly rent, rotary .distributer means to' cooperate i with said line relays in applying said curl rent to said selecting relays, and intercon-A l nections under the solecontrol of two of said linerelays to'disable the'relays 'of one group while enabling operation of the relays of the other group.

8. Ina telegraph-system, alplurality of `impulse 'receiving relays, a plurality of se- 1 lecting relays, a distributer, and an energizing circuit forrsaid selecting relays completed through the contacts of said impulse receiving relays andY said distributer, and

yrendered ineffective due to the cne'rgization of said receiving relays by the transmission of a certain group of impulsesover said line.

9. In a telegraph receiving system, a source of current, a plurality of polarized line relays, a plurality of groups of selecting relays, distributer means to serve jointly with said line relays in applying the current to said groups of selecting relays, and

interconnections under the sole control of two of said relays to limit said applicationsI vof current to the operation of one relay only in said groups of selecting relays at one and the same time.

10. In a telegraph receiving system, a plurality of polarized line relays, a plurality of selecting' relays, distributer means, interconnections to establish said selecting rela-ys in groups of three relays with respect to centrol by said polarized relaysi a source or current,- means jointly controlled by said relaysand said clistrihuter for applying said v current to a single relay of veach group, and means controlled `by said distrihutei' for dis.- 10 abling each group of said selecting' relays.

ln Witness whereof, l hereunto subscribe my namethis 21st Clay vof July A. D., 1917; v JOHN HUME BELL 

